Mine-roof support.



F. C. KEIGHLEY.

MINE ROOF SUPPORT.

APPLICATION FILED MAY 5, 1908.

904,878. Patented Nov. 24, 1908.

( nventor lvihwoou FREDERICK O. KEIGHLEY, OF UNIONTOWN, PENNSYLVANIA.

MINE-ROOF SUPPORT.

Specification of Letters Patent.

Application filed May 5, 1908.

Patented Nov. 24:, 1908.

Serial No. 431,065.

To all whom it may concern:

Be it known that I, FREDERICK G. Kerou- LEY, a citizen of the UnitedStates, residing at Uniontown, in the county of Fayette and State ofPennsylvania, have invented a new and useful Mine-Roof Support; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

The invention relates to a support for the roof of a mine and has forits object to provide an exceedingly simple, strong and durable deviceof this character adapted to be used in supporting mines of variouskinds.

This invention is an improvement over my Patent No. 875,182 which wasissued to me December 31, 1907.

The main features of the device will hereinafter appear.

In the accompanying drawing Figure 1 is a side elevation of a mine roofsupport constructed in accordance with this invention. Fig. 2 is aperspective view of the stirrup.

Referring to the drawings, 1 and 2 designate the standards or minesupports of my device which converge, as shown in the drawing, towardthe top. Horizontally arranged across the top of these standards is across beam 3 which is provided with recesses l which receive the upperend of the converging members and which hold the same in their properposition. The device braced by inclined braces or members 5 which abutagainst the inner faces of the upper portion of the standards, asclearly shown, and their upper ends form a junction, as at (3, beneaththe horizontal member 3. The lower ends of the braces are held againstdisplacement by means of stirrups 7, as clearly shown in the drawings.These stirrups are mounted on the outer ends of the cross beam 3 andalso engage the standards. The lower end of each stirrup is providedwith a projection 8 which is formed by a loop in the stirrup which iswelded together into one solid piece.

It will be seen that as pressure is applied to the upper or horizontalmember 3, the standards will have a tendency to move inwardly and willbe prevented from so doing by the brace members 5, as will be clearlyunderstood.

From the foregoing, the simplicity and exceeding great strength of thedevice will be clearly apparent; also the great advantage of speedyconstruction is an important point in the utility of this invention.

Having thus described the invention, what I claim as new and useful anddesire to secure by Letters Patent is A device of the class described,co1npris ing a pair of standards, a horizontal member, having notchesengaged by said standards, said standards being inclined inwardly,inclined braces extending from the upper part of said standards to apoint near the center of said horizontal member, stirrups adapted toencircle the upper portions of said standards and the ends of thehorizontal member, said stirrups being formed with projections at theirlower ends, said projections being adapted to support the inclinedbraces at the point where they meet the standards.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERICK C. KEIGHLEY.

Witnesses D. M. Bum, J. G. GARRoLL.

